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Won't rev up

This is a discussion on Won't rev up within the RZR 800 Specific Discussion forums, part of the General RZR category; You really need to do a static, not running, TPS adjustment. There is one other thing, the wires into the connector into the ECU have ...


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  #16  
Old November 6th, 2012, 03:34 PM
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Re: Won't rev up

You really need to do a static, not running, TPS adjustment. There is one other thing, the wires into the connector into the ECU have caused me problems on a 08'. Thought that was fixed in 09' and later with a much stronger setup. If it is the later setup it will have a very good connector set up. If not, then just the wiring harness going into the ECU are very visible. What happens is the harness weight pulls on the wires to the point they make bad connections to the pins in the ECU. Have had to remove the connector and work slack into the wire connections. First thing for me is to do a static check on the TPS.

If you think it is the ECU I have one never used. The ECU has to be programmed/flashed for your machine by the dealer.
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  #17  
Old November 6th, 2012, 03:34 PM
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Rzr Icon Re: Won't rev up

Was the 39 PSI at idle or wide open? It has to keep a consistent 39 psi. It is very possible it can do 39 psi at idle but not at WOT. We are talking pressure and plus volume.
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  #18  
Old November 6th, 2012, 05:53 PM
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Re: Won't rev up

Quote: Originally Posted by sandblster View Post
You really need to do a static, not running, TPS adjustment. There is one other thing, the wires into the connector into the ECU have caused me problems on a 08'. Thought that was fixed in 09' and later with a much stronger setup. If it is the later setup it will have a very good connector set up. If not, then just the wiring harness going into the ECU are very visible. What happens is the harness weight pulls on the wires to the point they make bad connections to the pins in the ECU. Have had to remove the connector and work slack into the wire connections. First thing for me is to do a static check on the TPS.

If you think it is the ECU I have one never used. The ECU has to be programmed/flashed for your machine by the dealer.
The TPS test was done with the engine off but key on.

That's what I initially thought it was because last year I would occasionally have a similar problem and wiggling the ECU connection would solve it. Even after I cleaned the connection thoroughly it didn't help this time but I will definately check the connection again.

Last edited by RZRDMR; November 6th, 2012 at 06:00 PM.
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  #19  
Old November 6th, 2012, 05:58 PM
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Re: Won't rev up

Quote: Originally Posted by N0OSV View Post
Was the 39 PSI at idle or wide open? It has to keep a consistent 39 psi. It is very possible it can do 39 psi at idle but not at WOT. We are talking pressure and plus volume.
I checked it stopped and idling. It stalled while idling before I could test it a WOT, however it still had 39#. I was by myself and didn't have a long enough hose on the gauge to see it from the cab. I'll check it again.
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  #20  
Old November 6th, 2012, 06:08 PM
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Re: Won't rev up

Have you checked compression? Just to rule out jumped timing and to check the plugs to see if both cyl are firing ok.
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  #21  
Old November 7th, 2012, 03:01 PM
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Re: Won't rev up

I rechecked the fuel pressure and it was a constant 39# even at WOT. Also rechecked ECU connection and it looked good. I decided to put it away until spring and limped it over to the storage shed ( still running like $h^t). I left it idling while I got the door to the shed open. When I went to move the RZR in it seemed to run normally, so I backed it up and went for a rip around the yard (I live on an acreage). It ran perfectly, wth! I don't know whether to be happy that it's running again or pi$$ed because I don't know what caused the problem. Whithout knowing what the problem was I'm scared it'll leave me stranded on the trail again.
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  #22  
Old November 7th, 2012, 04:21 PM
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Re: Won't rev up

are you using fuel with ethaol?
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  #23  
Old November 7th, 2012, 06:53 PM
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Re: Won't rev up

Quote: Originally Posted by yamadog82 View Post
are you using fuel with ethaol?
I'm not sure, it may have up to 10% ethanol, but the problem occurred suddenly and disappeared just as suddenly.
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  #24  
Old November 7th, 2012, 07:17 PM
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Re: Won't rev up

I don't know then , only problem I have had was I got gas from a gas station and the rzr ran very bad I tested the fuel and it had about 30-40 ethanol, it will settle on the bottom of the tank of the gas station, any station that dose not sale a lot of fuel can cause you to can get fuel with a much higher ethanol ratio. Causing hard starts when hot running rough
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  #25  
Old November 14th, 2012, 08:19 PM
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Re: Won't rev up

Does it sound/feel like a cylinder is missing?

I had an issue with the spark plug boot arcing to where they plug in behind the seat which caused one cylinder to not fire and it to not rev/run well at all. I had to mummify it in electrical tape for a quick fix but now have put dielectric grease on it as well and hope it's a more permanent fix. I'll get new wires eventually.

I found it out the hard way and touched the boots while it was running and got the electrical pulse sent to me! That shouldn't happen on a properly sealed boot.
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  #26  
Old November 16th, 2012, 09:08 AM
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Re: Won't rev up

Quote: Originally Posted by RZR_NE View Post
Does it sound/feel like a cylinder is missing?

I had an issue with the spark plug boot arcing to where they plug in behind the seat which caused one cylinder to not fire and it to not rev/run well at all. I had to mummify it in electrical tape for a quick fix but now have put dielectric grease on it as well and hope it's a more permanent fix. I'll get new wires eventually.

I found it out the hard way and touched the boots while it was running and got the electrical pulse sent to me! That shouldn't happen on a properly sealed boot.
I inspected the caps and they looked good. I think sometimes both cylinders were cutting out, sometimes only one. It is running fine now. Come spring we'll soak down all electrical connections and see if we can find the problem.
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  #27  
Old November 18th, 2012, 12:50 PM
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Usa Re: Won't rev up

Quote: Originally Posted by RZRDMR View Post
/09 RZR 800 will start & idle but will only rev up if you contiuously pump the accelerator peddle. If you hold the peddle steady the engine dies. I've cleaned all the electronic connections related to the engine but nothing helps. Anyone got any ideas?
Hello, mind did that same thing 2013 rzrs, try this once you warm it up good put it in drive keep patting the accelerator to the floor but dont hold it to the floor it will clear right up. I hope this will help you out. is your check engine light on to mind was two.
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  #28  
Old November 18th, 2012, 02:29 PM
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Re: Won't rev up

Quote: Originally Posted by motorman350 View Post
Quote: Originally Posted by RZRDMR View Post
/09 RZR 800 will start & idle but will only rev up if you contiuously pump the accelerator peddle. If you hold the peddle steady the engine dies. I've cleaned all the electronic connections related to the engine but nothing helps. Anyone got any ideas?
Hello, mind did that same thing 2013 rzrs, try this once you warm it up good put it in drive keep patting the accelerator to the floor but dont hold it to the floor it will clear right up. I hope this will help you out. is your check engine light on to mind was two.
If i was to try that when mine was running bad it would accelerate a bit but wouldn't clear up.
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  #29  
Old November 18th, 2012, 02:36 PM
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Usa Re: Won't rev up

Quote: Originally Posted by RZRDMR View Post
Quote: Originally Posted by motorman350 View Post
Quote: Originally Posted by RZRDMR View Post
/09 RZR 800 will start & idle but will only rev up if you contiuously pump the accelerator peddle. If you hold the peddle steady the engine dies. I've cleaned all the electronic connections related to the engine but nothing helps. Anyone got any ideas?
Hello, mind did that same thing 2013 rzrs, try this once you warm it up good put it in drive keep patting the accelerator to the floor but dont hold it to the floor it will clear right up. I hope this will help you out. is your check engine light on to mind was two.
If i was to try that when mine was running bad it would accelerate a bit but wouldn't clear up.
Ok did you try changing the spark plug?
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  #30  
Old July 25th, 2013, 08:01 PM
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Re: Won't rev up

The plug boots have a resistor in them, unscrew the wire from the boot and check them with an ohm meter, should read 5000 Ohms roughly. Also check that your ignition coil is grounded well, mounting bolts tight,etc.
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